WO1999006678A1 - Ventilsteuerung einer als antrieb oder bremse schaltbaren brennkraftmaschine - Google Patents
Ventilsteuerung einer als antrieb oder bremse schaltbaren brennkraftmaschine Download PDFInfo
- Publication number
- WO1999006678A1 WO1999006678A1 PCT/DE1998/001925 DE9801925W WO9906678A1 WO 1999006678 A1 WO1999006678 A1 WO 1999006678A1 DE 9801925 W DE9801925 W DE 9801925W WO 9906678 A1 WO9906678 A1 WO 9906678A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- brake
- camshaft
- valve
- camshafts
- cam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
- F01L13/0047—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction the movement of the valves resulting from the sum of the simultaneous actions of at least two cams, the cams being independently variable in phase in respect of each other
Definitions
- Valve control of an internal combustion engine that can be switched as a drive or brake
- the invention relates to a valve control of an internal combustion engine which can be switched as a drive or a brake according to the preamble of claim 1.
- a corresponding valve control is shown in Fig. 4 of EP 458857. It is hereby expressly incorporated by reference and is considered part of the present disclosure.
- Three valves are arranged in a cylinder head, an intake valve, an exhaust valve and a decompression valve which is only open when the engine brake is activated and which connects to the exhaust system. Each valve is operated via its own camshaft.
- a switchable plunger sits between the decompression valve and the assigned camshaft, which transmits the cam movement to the decompression valve only in engine braking mode.
- the disadvantage of the described engine brake is that, depending on the speed, a non-controllable braking power is provided which is essentially determined by the stroke volume, towing power and by the design of the valves, the valve train and the brake flap.
- the present invention is therefore concerned with the problem of valve control as a drive or Brake switchable internal combustion engine to adapt the braking power provided by an engine brake to different requirements. This problem is solved by the characterizing features of claim 1.
- Brake cam shaft is to be understood here as meaning both an additional camshaft and one or more brake cams arranged coaxially on the main camshaft and adjustable in their phase position.
- the brake camshaft can be switched on in a known manner by reducing the valve clearance or by means of a switchable valve lever or tappet, as in EP 458857.
- Gearboxes for changing the relative phase position of camshafts are known for varying the charge exchange. B. from EP 396280 and EP 202682.
- Controlling the engine braking power by adjusting the engine brake flap installed in the exhaust tract is also known. However, only a part of the braking power delivered by the engine brake can be controlled.
- a further part of the braking power can be variably adjusted by the present invention.
- the desired braking power is set by setting the corresponding phase shift. If only a small braking power is required, the valve causing the decompression either opens well before TDC or only after TDC, so that part of the compression work is not applied in the first case and is recovered by expansion in the second case before decompression begins.
- a particularly advantageous embodiment of the invention is specified by claim 2.
- Cams of both shafts assigned to each other act on only one, two common levers. No switching device is then required to switch on the brake valve, the brake camshaft becomes effective solely through the phase shift between the two camshafts or remains ineffective in a certain range of the phase shift.
- both shafts run roughly in phase, both cams try to contact the valve lever at the same time.
- the cam of the brake camshaft does not make contact with the valve lever, since the lever is rotated by the cam of the main camshaft out of the effective range of the cam of the brake camshaft.
- Fig. 1 shows a schematic diagram of the valve control according to the invention
- Fig. 2 shows the phase position of the main cam and brake cam in engine operation
- Fig. 3 shows the phase relationship of the main cam and brake cam in braking operation
- Fig. 4 shows the arrangement of a coaxially adjustable in its phase position brake cam on the main camshaft in cross section.
- the brake flap in the exhaust system that is regularly present in engine brake systems is not shown in the drawing.
- FIGS. 2 and 3 each show the opening curve of the exhaust valve as a function of the crankshaft angle in the upper area, and the relative position of the camshafts to one another in the lower area.
- the dotted curve shows the opening curve of the exhaust valve generated by the brake camshaft.
- a valve lever 4 which can be actuated by a main camshaft 5 and a brake camshaft 6.
- the phase position of both camshafts can be rotated with respect to one another by a phase adjustment gearbox P (indicated by arrows to the camshafts starting from P).
- the brake camshaft 6 is ineffective because both Rotate shafts 5 and 6 in phase and the cam 7 of the main camshaft 5 lifts the valve lever 4 so far that the clearance S is present between the cam 8 of the brake camshaft 6 and the valve lever 4.
- phase shift Ph of the brake camshaft 6 With a phase shift Ph of the brake camshaft 6, the cam 8 also takes effect.
- the phase shift Ph between the main camshaft 5 and the brake camshaft 6 is set so that the brake camshaft 6 actuates the exhaust valve 3 at approximately the end of the compression stroke in order to achieve the maximum braking power.
- the braking power of the motor brake can be adapted to the respective requirements by varying the phase shift Ph.
- the valve lever can also be fork-shaped, with both camshafts engaging different forks.
- One camshaft can also contact the valve lever from below and the other from above.
- Fig. 2 is the phase position of the cams in engine operation
- FIG. 4 shows the arrangement of a brake cam 6, 8, which is displaceable in its phase position by a phase adjustment gear P, on a main camshaft 5.
- the cam of the main camshaft has the reference number 7.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000505408A JP2001512206A (ja) | 1997-08-01 | 1998-07-06 | 駆動装置またはブレーキ装置として切替可能な内燃機関の弁制御装置 |
| EP98943670A EP1000226A1 (de) | 1997-08-01 | 1998-07-06 | Ventilsteuerung einer als antrieb oder bremse schaltbaren brennkraftmaschine |
| BR9811812-9A BR9811812A (pt) | 1997-08-01 | 1998-07-06 | Sistema de controle de válvula de uma máquina de combustão interna que pode ser ligada como acionamento ou como freio |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1997133322 DE19733322A1 (de) | 1997-08-01 | 1997-08-01 | Ventilsteuerung einer als Antrieb oder Bremse schaltbaren Brennkraftmaschine |
| DE19733322.2 | 1997-08-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999006678A1 true WO1999006678A1 (de) | 1999-02-11 |
Family
ID=7837707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE1998/001925 Ceased WO1999006678A1 (de) | 1997-08-01 | 1998-07-06 | Ventilsteuerung einer als antrieb oder bremse schaltbaren brennkraftmaschine |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1000226A1 (de) |
| JP (1) | JP2001512206A (de) |
| BR (1) | BR9811812A (de) |
| DE (1) | DE19733322A1 (de) |
| WO (1) | WO1999006678A1 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10116143A1 (de) * | 2001-03-30 | 2002-10-10 | Man Nutzfahrzeuge Ag | Motorbremse |
| DE10116300A1 (de) | 2001-03-31 | 2002-10-02 | Mahle Ventiltrieb Gmbh | Einrichtung zum Betätigen der Gaswechselventile eines Verbrennungsmotors und Verfahren zur Handhabung dieser Einrichtung |
| EP1649148B1 (de) * | 2004-07-17 | 2006-12-13 | MAHLE Ventiltrieb GmbH | Steuereinrichtung für ein ventil, insbesondere ein gaswechselventil eines verbrennungsmotors |
| DE102006002145A1 (de) * | 2006-01-17 | 2007-07-19 | Daimlerchrysler Ag | Gaswechselventilbetätigungsvorrichtung |
| DE102007007758A1 (de) * | 2007-02-16 | 2008-08-21 | Mahle International Gmbh | Ventiltrieb eines Hubkolben-Verbrennungsmotors |
| DE102007038078A1 (de) * | 2007-08-11 | 2009-02-12 | Daimler Ag | Gaswechselventilbetätigungsvorrichtung |
| DE102017201343A1 (de) | 2017-01-27 | 2018-08-02 | Mahle International Gmbh | Ventiltrieb für eine Hubkolbenbrennkraftmaschine und Verfahren zur Ventilsteuerung in einer Hubkolbenbrennkraftmaschine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR706233A (fr) * | 1930-02-15 | 1931-06-20 | Dispositif de commande de soupapes | |
| US2907311A (en) * | 1957-09-04 | 1959-10-06 | Waldron Frederic Barnes | Valve operating mechanism of reciprocating internal combustion engines |
| EP0202682A2 (de) | 1985-05-22 | 1986-11-26 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Vorrichtung zur relativen Drehlagenänderung einer Steuerwelle, insbesondere von einer Kurbelwelle einer Brennkraftmaschine angetriebenen Steuerwelle, vor allem für Gaswechselventile |
| EP0396280A1 (de) | 1989-05-03 | 1990-11-07 | Jaguar Cars Limited | Nockenwellenantriebsvorrichtung |
| EP0458857A1 (de) | 1989-02-15 | 1991-12-04 | Volvo Ab | Verfahren und vorrichtung zum bremsen eines viertaktverbrennungsmotors. |
| EP0818612A1 (de) * | 1996-07-10 | 1998-01-14 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Motorbremsvorrichtung |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2832526A1 (de) * | 1978-07-25 | 1980-02-07 | Maschf Augsburg Nuernberg Ag | Viertakt-brennkraftmaschine mit motor-auspuffbremse |
| DE3509094A1 (de) * | 1984-04-06 | 1985-10-17 | Volkswagenwerk Ag, 3180 Wolfsburg | Einrichtung zum stufenlosen verstellen der steuerzeiten von gaswechselventilen |
| DE3624827A1 (de) * | 1986-07-23 | 1988-02-04 | Sueddeutsche Kolbenbolzenfabri | Verstelleinrichtung fuer eine nockenwelle zum steuern der gasein- und auslassventile von verbrennungsmotoren |
| DE3933943A1 (de) * | 1988-10-28 | 1990-05-03 | Volkswagen Ag | Einrichtung zum stufenlosen verstellen der steuerzeiten von gaswechselventilen |
| DE4441946A1 (de) * | 1994-11-25 | 1996-05-30 | Hansbernd Berzheim | Vorrichtung zur beliebig großen stufenlosen Phasenverschiebung einer Nockenwelle eines Hubkolben-Motors |
| DE19515496A1 (de) * | 1995-04-27 | 1995-10-05 | Steffen Kirsch | Radial verschiebbare Nockenwelle für Verbrennungsmotoren |
-
1997
- 1997-08-01 DE DE1997133322 patent/DE19733322A1/de not_active Withdrawn
-
1998
- 1998-07-06 BR BR9811812-9A patent/BR9811812A/pt active Search and Examination
- 1998-07-06 JP JP2000505408A patent/JP2001512206A/ja active Pending
- 1998-07-06 EP EP98943670A patent/EP1000226A1/de not_active Withdrawn
- 1998-07-06 WO PCT/DE1998/001925 patent/WO1999006678A1/de not_active Ceased
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR706233A (fr) * | 1930-02-15 | 1931-06-20 | Dispositif de commande de soupapes | |
| US2907311A (en) * | 1957-09-04 | 1959-10-06 | Waldron Frederic Barnes | Valve operating mechanism of reciprocating internal combustion engines |
| EP0202682A2 (de) | 1985-05-22 | 1986-11-26 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Vorrichtung zur relativen Drehlagenänderung einer Steuerwelle, insbesondere von einer Kurbelwelle einer Brennkraftmaschine angetriebenen Steuerwelle, vor allem für Gaswechselventile |
| EP0458857A1 (de) | 1989-02-15 | 1991-12-04 | Volvo Ab | Verfahren und vorrichtung zum bremsen eines viertaktverbrennungsmotors. |
| EP0396280A1 (de) | 1989-05-03 | 1990-11-07 | Jaguar Cars Limited | Nockenwellenantriebsvorrichtung |
| EP0818612A1 (de) * | 1996-07-10 | 1998-01-14 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Motorbremsvorrichtung |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1000226A1 (de) | 2000-05-17 |
| JP2001512206A (ja) | 2001-08-21 |
| DE19733322A1 (de) | 1999-02-04 |
| BR9811812A (pt) | 2000-08-15 |
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